Modig-kode....

params: >-
  ['
  {%- set rooms = {
    "25": "input_boolean.vacuum_kitchen",
    "17": "input_boolean.vacuum_bedroom",
    "21": "input_boolean.vacuum_livingroom",
    "19": "input_boolean.vacuum_hallway"
  } -%}
  {%- for id in rooms %}
    {%- if is_state(rooms[id], 'on') %}
      {%- if not loop.first -%},{%- endif -%}
      {{ id }}
    {%- endif %}
  {%- endfor -%}
  ']